diff --git a/cmd/server/main.go b/cmd/server/main.go
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -408,10 +408,11 @@ // non-deleted subjects. This avoids race conditions and eventual consistency issues.
 	voteService := votes.NewService(voteRepo, oauthClient, oauthStore, voteCache, nil)
 	log.Println("✅ Vote service initialized (with OAuth authentication and vote cache)")
 
-	// Initialize comment service (for query API)
+	// Initialize comment service (for query and write APIs)
 	// Requires user and community repos for proper author/community hydration per lexicon
-	commentService := comments.NewCommentService(commentRepo, userRepo, postRepo, communityRepo)
-	log.Println("✅ Comment service initialized (with author/community hydration)")
+	// OAuth client and store are needed for write operations (create, update, delete)
+	commentService := comments.NewCommentService(commentRepo, userRepo, postRepo, communityRepo, oauthClient, oauthStore, nil)
+	log.Println("✅ Comment service initialized (with author/community hydration and write support)")
 
 	// Initialize feed service
 	feedRepo := postgresRepo.NewCommunityFeedRepository(db, cursorSecret)
@@ -528,6 +529,13 @@ log.Println("Post XRPC endpoints registered with OAuth authentication")
 
 	routes.RegisterVoteRoutes(r, voteService, authMiddleware)
 	log.Println("Vote XRPC endpoints registered with OAuth authentication")
+
+	// Register comment write routes (create, update, delete)
+	routes.RegisterCommentRoutes(r, commentService, authMiddleware)
+	log.Println("Comment write XRPC endpoints registered")
+	log.Println("  - POST /xrpc/social.coves.community.comment.create")
+	log.Println("  - POST /xrpc/social.coves.community.comment.update")
+	log.Println("  - POST /xrpc/social.coves.community.comment.delete")
 
 	routes.RegisterCommunityFeedRoutes(r, feedService, voteService, authMiddleware)
 	log.Println("Feed XRPC endpoints registered (public with optional auth for viewer vote state)")
diff --git a/internal/api/routes/comment.go b/internal/api/routes/comment.go
new file mode 100644
--- /dev/null
+++ b/internal/api/routes/comment.go
@@ -0,0 +1,35 @@
+package routes
+
+import (
+	"Coves/internal/api/handlers/comments"
+	"Coves/internal/api/middleware"
+	commentsCore "Coves/internal/core/comments"
+
+	"github.com/go-chi/chi/v5"
+)
+
+// RegisterCommentRoutes registers comment-related XRPC endpoints on the router
+// Implements social.coves.community.comment.* lexicon endpoints
+// All write operations (create, update, delete) require authentication
+func RegisterCommentRoutes(r chi.Router, service commentsCore.Service, authMiddleware *middleware.OAuthAuthMiddleware) {
+	// Initialize handlers
+	createHandler := comments.NewCreateCommentHandler(service)
+	updateHandler := comments.NewUpdateCommentHandler(service)
+	deleteHandler := comments.NewDeleteCommentHandler(service)
+
+	// Procedure endpoints (POST) - require authentication
+	// social.coves.community.comment.create - create a new comment on a post or another comment
+	r.With(authMiddleware.RequireAuth).Post(
+		"/xrpc/social.coves.community.comment.create",
+		createHandler.HandleCreate)
+
+	// social.coves.community.comment.update - update an existing comment's content
+	r.With(authMiddleware.RequireAuth).Post(
+		"/xrpc/social.coves.community.comment.update",
+		updateHandler.HandleUpdate)
+
+	// social.coves.community.comment.delete - soft delete a comment
+	r.With(authMiddleware.RequireAuth).Post(
+		"/xrpc/social.coves.community.comment.delete",
+		deleteHandler.HandleDelete)
+}